This team is really bad.. you get instakilled by a No Guard Deoxys-Speed because you don't have ANY Wonder Guard mons. I'll tell you what you can fix.
Chansey (F) @ Eviolite
Ability: Imposter
EVs: 252 HP / 252 Def / 4 SpD
Calm Nature
IVs: 0 Atk
- Defog
- Encore
- Metal Burst
- Baton Pass/Parting Shot
Trust me, this set will save you in the future. I changed Chansey to Blissey because it gets Eviolite boost and Imposter is just really good as a whole. It makes you incredibly bulky than the mon you've transformed into. Defog is to get rid of Stealth Rock and entry hazards. Encore to cripple mons that setup, Metal Burst to do both physical and special revenge damage, and Baton Pass/ Parting Shot to pivot. There is zero need for Stun Spore or Sleep Powder since they are outclassed by Nuzzle and Spore/Dark Void.
Though Contrary Rayquaza-Mega is tempting, it is not very good in this meta since there are Hazers and Wonder Guards everywhere. Not to mention Pixilate-Diancie.
Aerodactyl-Mega @ Choice Band
Ability: Mold Breaker
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Ascent
- Diamond Storm
- Sacred Fire
- Thousand Arrows/Bolt Strike
Aerodactyl is the definition of blinding fast and super powerful. It's usually banded for an extra punch. Dragon Ascent and Diamond Storm for powerful STAB, Sacred Fire for coverage and Thousand Arrows to kill Electric Wonder Guarders. It outspeeds Gengar Mega and is able to revenge kill it.
OR
Latios-Mega (M) @ Safety Goggles / Lum Berry
Ability: Mold Breaker
EVs: 248 HP / 8 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Void/Spore
- Stealth Rock
- Substitute
- Baton Pass
This is more of a support Pokemon. Safety Goggles prevents it from being outsped and Spored by Gengar-Mega. I would personally choose Dark Void because it's not restricted by Safety Goggles users, but you can choose Spore if you want the extra accuracy. Stealth Rock bypasses Magic Bounce. Substitute and Baton pass creates synergy between Wonder Guard users.
Finally, another glaring flaw I see is the lack of Wonder Guard Pokemon. Most teams will usually need 2 or more Wonder Guard mons. Wonder Guard is especially powerful, and one of the best, if not the best ability in the meta. The Pokemon only takes damage from super effective attacks or indirect damage (like Toxic). You'll need some good ones.
Deoxys-Speed @ Leftovers
Ability: Wonder Guard
EVs: 248 HP / 8 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Taunt
- Magic Coat
- Substitute
- Baton Pass
(Most people will associate Deoxys-Speed with being a No Guard Sheer Cold user so this will be surprising.) Taunt prevents rocks, other status moves, Magic Coat prevents it from being taunted by other Deoxys-Speed or pranksters. Substitute and Baton Pass for Synergy.
And, uh, seriously? Levitate Raikou? Yeah, not going to work, considering it is not as fast as some of the hard hitters in the meta (Mega Mewtwo X) and will die in just 2 hits. And putting Wonder Guard and Air Balloon on an Electric mon seems tempting because NO WEAKNESSES, but it's pretty bad. Most of these Electric-Guard users are frail, and Mold Breaker mons DECIMATE them. That's why...
Audino-Mega @ Leftovers
Ability: Wonder Guard
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Wish
- Baton Pass
- Haze
- Gastro Acid
Audino-Mega is the best Wonder Guard Pokemon! It's crazy bulky and a great Wish passer due to its high HP. Baton Pass keeps up the synergy between the team, Gastro Acid gets rid of Mega Mewtwo X's Pure Power-boosted Gear Grind.
importable: https://pokepast.es/0d285feb8d563a39